01 - Heat oven to 425°F and line a large baking sheet with parchment paper.
02 - In a large bowl, toss the Brussels sprouts with olive oil, kosher salt, and black pepper until evenly coated.
03 - Place Brussels sprouts cut side down in a single layer on the prepared baking sheet.
04 - Roast for 20–25 minutes, flipping once halfway through, until the edges are deeply golden and crispy.
05 - Meanwhile, whisk honey, apple cider vinegar, and chili flakes (if using) together in a small bowl.
06 - Transfer roasted Brussels sprouts to a serving bowl, immediately drizzle with the honey glaze, and toss gently to coat.
07 - Sprinkle with toasted almonds and flaky sea salt before serving.